﻿using System;
using System.Collections.Generic;
using System.IO;
using System.Security.Cryptography;
using System.Text;

namespace Core.Shop.Tool
{
    public class PasswordHelper
    {
        public string CodePassword(string str)
        {
            //把字符串放到byte数组中
            byte[] bytIn = Encoding.Default.GetBytes(str);
            //建立加密对象的密钥和偏移量        
            byte[] iv = { 102, 16, 93, 156, 78, 4, 218, 32 };//定义偏移量
            byte[] key = { 55, 103, 246, 79, 36, 99, 167, 3 };//定义密钥
            //实例DES加密类
            DESCryptoServiceProvider mobjCryptoService = new DESCryptoServiceProvider();
            mobjCryptoService.Key = iv;
            mobjCryptoService.IV = key;
            ICryptoTransform encrypto = mobjCryptoService.CreateEncryptor();
            //实例MemoryStream流加密密文件
            MemoryStream ms = new MemoryStream();
            CryptoStream cs = new CryptoStream(ms, encrypto, CryptoStreamMode.Write);
            cs.Write(bytIn, 0, bytIn.Length);
            cs.FlushFinalBlock();
            return Convert.ToBase64String(ms.ToArray());
        }
        public string UnCodePassword(string str)
        {
            try
            {
                //将解密字符串转换成字节数组
                byte[] bytIn = System.Convert.FromBase64String(str);
                //给出解密的密钥和偏移量，密钥和偏移量必须与加密时的密钥和偏移量相同
                byte[] iv = { 102, 16, 93, 156, 78, 4, 218, 32 };//定义偏移量
                byte[] key = { 55, 103, 246, 79, 36, 99, 167, 3 };//定义密钥
                DESCryptoServiceProvider mobjCryptoService = new DESCryptoServiceProvider();
                mobjCryptoService.Key = iv;
                mobjCryptoService.IV = key;
                //实例流进行解密
                MemoryStream ms = new MemoryStream(bytIn, 0, bytIn.Length);
                ICryptoTransform encrypto = mobjCryptoService.CreateDecryptor();
                CryptoStream cs = new CryptoStream(ms, encrypto, CryptoStreamMode.Read);
                StreamReader strd = new StreamReader(cs, Encoding.Default);
                return strd.ReadToEnd();
            }
            catch (Exception ex)
            {
                return ex.ToString();
            }
        }
    }
}
